A convex mirror has a radius of 10 cm. What is its focal length?
A. 10 cm
B. 5.0 cm
C. 20 cm
D. -5.0 cm
E. -10 cm
D. -5.0 cm
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The highest-strength carbon steels with some ductility have a microstructure described as:
(a) Martensite. (b) Pearlite. (c) Bainite. (d) Tempered martensite.
Galaxy A is 300 Mpc from Galaxy B. Hubble's Law says that V=H0 x D. About how fast is Galaxy A receding from the perspective of Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A) 30000 km/s B) 75 km/s C) 22500 km/s D) 15000 km/s E) 225 km/s
Neglecting friction, a ball rolling along a horizontal plane will
1) accelerate indefinitely. 2) roll until the force used to roll it was used up. 3) roll indefinitely at a constant speed. This illustrates 4) the basic principle that a body requires a push or pull to keep it moving. 5) inertia. 6) the law of net force.
The secondary of a transformer is the coil connected to
A) the load. B) the Internet. C) the input power line. D) none of the above